BoilerFaultCodes.com

Grant Vortex Fault Codes

Oil Oil 12-70 kW 2002-present

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Most common fault codes

C2849
Your boiler has stopped working because of a communication failure between its internal electronic brains and a fault in the ignition system.
Gas Safe engineer required · £180-450
E01
Your boiler's main internal computer has encountered a processing error and cannot safely operate.
May be DIY safe · £250-450
EE1
Your boiler has sensed a blockage or a pump failure that is stopping water from moving through the system properly.
May be DIY safe · £180-350

All 20 fault codes

Code Severity Plain English
C2849 High Your boiler has stopped working because of a communication failure between its internal electronic brains and a fault in the ignition system.
E01 High Your boiler's main internal computer has encountered a processing error and cannot safely operate.
EE1 High Your boiler has sensed a blockage or a pump failure that is stopping water from moving through the system properly.
EE2 High Your boiler has detected that the water pressure in the central heating system is too low to operate safely.
EE3 High Your boiler has stopped working because it has lost the electrical connection to its temperature sensor.
EE4 High Your boiler has detected that the electrical wiring coming into the unit is connected the wrong way round.
EE8 High Your boiler's main control board has lost contact with the digital display or internal computer, meaning it can no longer send or receive instructions.
Flashing on and off Low Your boiler is temporarily pausing to melt away ice build-up and protect the external components during very cold weather.
OPn High Your boiler has detected that a temperature sensor cable has disconnected or become faulty, preventing the system from monitoring water flow correctly.
OUTDR Low Your boiler has lost connection with its outside temperature sensor, which means the heating might not adjust correctly to the weather.
PP1 High Your boiler has stopped working because it cannot correctly measure the temperature of the water returning to the unit.
PP2 High Your boiler has detected a problem with a sensor that monitors the temperature of the exhaust gases, and it has likely stopped working as a safety precaution.
PP3 High Your boiler has stopped working because an internal sensor that monitors the temperature of the heating coil is no longer sending a correct reading.
PP4 High Your boiler has stopped working because one of its internal sensors is failing to monitor the temperature of the water returning to the unit.
PP5 High Your boiler's internal thermometer that measures the air around it has stopped working properly, preventing the system from operating safely.
PP6 High Your boiler has shut itself down because the internal gases have reached an unsafely high temperature to protect the system from damage.
PP7 Low Your boiler has detected very cold temperatures and is automatically running to prevent the internal pipes from freezing.
sHr High Your boiler has detected an electrical fault with its internal temperature sensors and has stopped running as a safety precaution.
SUP High Your boiler's temperature sensor has stopped sending the correct signals, meaning the system doesn't know how hot the water is and has shut down as a precaution.
U2453 High The boiler's internal computer has encountered a communication error between its memory and control systems, which prevents it from running correctly.

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